German Chancellor Olaf Scholz has called Russian allegations that Ukraine is preparing a “dirty bomb” untenable, government spokesman Steffen Hebestreit said in Berlin late Monday. Scholz spoke with Ukrainian President Volodymyr Zelensky by telephone, Hebestreit confirmed. “The chancellor agreed with the Ukrainian president that the independent investigations by the International Atomic Energy Agency initiated by the Ukrainian side would remove any doubts about this,” Hebestreit added. Russia has alleged that Kiev is planning to detonate a radioactive bomb to discredit Moscow. The Western nucl…